SOLUTION: In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and afte

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Question 1115002: In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.6 and a standard deviation of 16.7.
Construct a 99% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol?
What is the confidence interval estimate of the population mean mu?
_____mg/dL less than mu less than
_____mg/dL
What does the confidence interval suggest about the effectiveness of the treatment?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The mean change is 3.6 with sd 16.7.
99% CI half interval is t(0.995, df=42)*16.7/sqrt(43)
t=2.70
half interval is 6.88
the interval is +3.6+/-6.88
(-3.28, 10.48)
0 is in the interval; therefore, one has to conclude there is no significant change with this particular test.